CN107972224B - Low-voltage injection molding method for power capacitor shell - Google Patents
Low-voltage injection molding method for power capacitor shell Download PDFInfo
- Publication number
- CN107972224B CN107972224B CN201711399470.XA CN201711399470A CN107972224B CN 107972224 B CN107972224 B CN 107972224B CN 201711399470 A CN201711399470 A CN 201711399470A CN 107972224 B CN107972224 B CN 107972224B
- Authority
- CN
- China
- Prior art keywords
- injection molding
- low
- powder
- waste plastic
- molding method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/10—Conditioning or physical treatment of the material to be shaped by grinding, e.g. by triturating; by sieving; by filtering
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to a low-pressure injection molding method for a power capacitor shell, which comprises the steps of sequentially placing isotactic polypropylene homopolymer, modified waste plastic shell powder, talcum powder, silicon micropowder, fluororubber, nucleating agent and antioxidant in a stirrer, and uniformly mixing to prepare a mixture; and placing the mixture into a hopper of a low-pressure injection molding machine, performing melt plasticizing on the mixture in the hopper of the low-pressure injection molding machine through each zone of a screw, performing injection molding on the mixture into a cavity of a mold, performing glue injection in sequence according to time periods, cooling the mold, opening the mold, ejecting out and taking out a product. The modified waste plastic shell powder is used for replacing part of isotactic polypropylene homopolymer, so that the waste polypropylene capacitor shell is recycled, the energy is saved, the environment is protected, the elasticity and the bending resistance of a finished product are not reduced, and the qualification rate of the finished product can reach 98.5%.
Description
Technical Field
The invention relates to the technical field of capacitors, in particular to a low-voltage injection molding method for a power capacitor shell.
Background
Power capacitors, capacitors for power systems and electrical equipment. Any two metal conductors are separated by an insulating medium, and thus a capacitor is formed. The capacitance of the capacitor is determined by its geometrical dimensions and the properties of the insulating medium between the two plates. When a capacitor is used under ac voltage, the capacitance of the capacitor is often expressed in terms of its reactive power.
The outer casing of the conventional power capacitor is generally a plastic casing or an aluminum casing, wherein most of the plastic casings are made of polymers such as ABS plastic, polypropylene and the like through an extruding machine. An extruder is an important plastic machine, and most of the production and manufacture of plastic products can be realized by extrusion molding. The plastic shell manufactured by the plastic extruding machine has high defective rate of waste parts, a large amount of leftover materials, residual plastic shell products, scrapped plastic shells caused by large product size error and serious damage and the like can be generated in the production process, and a large amount of waste shells are generated due to scrapping of the capacitor after long-term use.
Low pressure molding is a process of injecting a packaging material into a mold at a very low injection pressure and rapidly curing the molding. The equipment cost of the low-pressure injection molding process is low, and the traditional injection molding process equipment system is generally higher in cost, wherein the traditional injection molding process equipment system comprises a purchased high-pressure injection molding machine, a water cooling system and an expensive steel die; the low-pressure injection molding process equipment system is generally simpler and only consists of a hot melt adhesive machine, a working console and a mold; because the injection pressure is extremely low, the mould can adopt a cast aluminum mould, the design, development, processing and manufacturing of the mould are easy, and the material cost and the development cycle can be saved; due to low pressure and low temperature, the defective rate of the waste products of the finished products can be greatly reduced, and unnecessary waste is avoided. At present, the related researches on the low-voltage injection molding method or process of the power capacitor shell are less.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a low-voltage injection molding method for a power capacitor shell, which has the following specific technical scheme:
a low-voltage injection molding method for a power capacitor shell comprises the following steps: sequentially placing isotactic polypropylene homopolymer, modified waste plastic shell powder, talcum powder, silicon micropowder, fluororubber, nucleating agent and antioxidant in a stirrer, and uniformly mixing to prepare a mixture;
step two: placing the mixture into a hopper of a low-pressure injection molding machine, setting the temperature of each area of a screw of the low-pressure injection molding machine to be 220-235 ℃, and enabling the low-pressure injection molding machine to be in a state of being heatedThe temperature of the middle mold is set to be 70-80 ℃, the mixture in the hopper of the low-pressure injection molding machine is melted and plasticized by the screw rods and then injected into the cavity of the mold, wherein the glue melting rate is 30-40 cm3The glue melting pressure is 52-58 bar; and injecting the glue according to time periods and sequences, cooling the mould, opening the mould, ejecting out and taking out the product.
As an improvement of the technical scheme, in the step one, the mass ratio of the isotactic polypropylene homopolymer, the modified waste plastic shell powder, the talcum powder, the silicon micropowder, the fluororubber, the nucleating agent and the antioxidant is 100 (20-25): 6-7): 3-4): 0.12-0.15): 1.5-1.7): 0.3-0.36.
As an improvement of the technical scheme, the preparation method of the modified waste plastic shell powder comprises the following steps: crushing waste plastic powder into 120-mesh-screened waste plastic powder, uniformly mixing the waste plastic powder, benzoxazine resin, E51 type epoxy resin, linear phenolic resin, 2-methylimidazole, nickel sulfide and acetone according to the mass ratio of 100 (50-55): (25-28): (12-15): (0.5-0.6): 17-19): 50-60 to prepare a sizing material, then sending the sizing material into an oven to bake for 6-8 hours at 180-200 ℃ to prepare a plate-shaped rough blank with the thickness of 2-3 mm, rapidly freezing the plate-shaped rough blank by using liquid nitrogen to prepare 200-mesh-screened semi-finished product powder, immersing the semi-finished product powder into 6-10% hydrochloric acid to boil for 30-40 minutes to obtain a mixed solution, wherein the mass ratio of the semi-finished product powder to the hydrochloric acid is 1 (3-5); and filtering the mixed solution to obtain filter residue, washing the filter residue for 3-5 times by using deionized water, drying and then crushing again to obtain the modified waste plastic shell powder which is sieved by a 200-mesh sieve.
As an improvement of the technical scheme, the waste plastic shell is a waste polypropylene capacitor shell.
As an improvement of the technical scheme, the antioxidant is one or more of hindered phenol antioxidants, phosphite esters and thioether.
As an improvement of the technical scheme, the nucleating agent is an aliphatic carboxylic acid metal compound.
As an improvement of the technical scheme, the glue injection speed in the second step is 39.5-41.3 cm3And/s, the glue injection pressure is 86-95 bar.
As an improvement of the technical scheme, the glue injection in the second step is divided into 6 sections for glue injection, and the time range of each glue injection time section is 4-6 s.
The invention has the beneficial effects that: by optimizing and adjusting the existing low-pressure injection molding process, the finished product has high qualification rate and good elasticity. The modified waste plastic shell powder is used for replacing part of isotactic polypropylene homopolymer, so that the waste polypropylene capacitor shell is recycled, and the energy is saved and the environment is protected; the modified waste plastic shell powder is prepared by crushing waste polypropylene capacitor shells, preparing plate-shaped rough blanks from the crushed waste polypropylene capacitor shells, benzoxazine resin, E51 type epoxy resin, linear phenolic resin, 2-methylimidazole, nickel sulfide and acetone, quickly freezing the plate-shaped rough blanks by using liquid nitrogen, crushing the plate-shaped rough blanks into semi-finished product powder, and finally removing nickel sulfide in the semi-finished product powder by using hydrochloric acid; the modified waste plastic shell powder replaces part of isotactic polypropylene homopolymer, so that the elasticity and bending resistance of the finished product are not reduced, and the qualification rate of the finished product can reach 98.5%.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Weighing isotactic polypropylene homopolymer, modified waste plastic shell powder, talcum powder, silicon micropowder, fluororubber, nucleating agent and antioxidant according to the mass ratio of 100:20:6:3:0.12:1.5:0.3, sequentially placing the materials in a stirrer, and uniformly mixing to prepare a mixture, wherein the antioxidant is a hindered phenol antioxidant, and the nucleating agent is a fatty carboxylic acid metal compound; placing the mixture into a hopper of a low-pressure injection molding machine, setting the temperature of each zone of a screw of the low-pressure injection molding machine to be 220-235 ℃, setting the temperature of a mold in the low-pressure injection molding machine to be 70-80 ℃, melting and plasticizing the mixture in the hopper of the low-pressure injection molding machine through each zone of the screw, and injecting the mixture into a cavity of the mold, wherein the melt rate is 30-40 cm3The pressure of the molten adhesive is 52-58 bar; injecting glue according to time period and sequence, wherein the injection speed is 39.5-41.3 cm3The glue injection pressure is 86-95 bar, the glue injection is divided into 6 sections for glue injection, and the time range of each glue injection time section is 4-6 s; and after the mold is cooled, opening the mold, ejecting out and taking out the mold to obtain the power capacitor shell.
The preparation method of the modified waste plastic shell powder comprises the following steps: crushing waste polypropylene capacitor shells into waste plastic powder which is sieved by a 120-mesh sieve, and uniformly mixing the waste plastic powder, benzoxazine resin, E51 type epoxy resin, linear phenolic resin, 2-methylimidazole, nickel sulfide and acetone according to the mass ratio of 100:50:25:12:0.5:17:50 to prepare a sizing material, wherein the benzoxazine resin is CB8 series fast curing type benzoxazine resin produced by Yokoku high molecular science and technology limited; then, baking the sizing material in an oven at 180-200 ℃ for 6-8 hours to prepare a plate-shaped rough blank with the thickness of 2-3 mm, rapidly freezing the plate-shaped rough blank by using liquid nitrogen, crushing the plate-shaped rough blank to prepare semi-finished product powder which is sieved by a 200-mesh sieve, immersing the semi-finished product powder into hydrochloric acid with the mass fraction of 6-10%, and boiling for 30-40 min to obtain a mixed solution, wherein the mass ratio of the semi-finished product powder to the hydrochloric acid is 1: 3; and filtering the mixed solution to obtain filter residue, washing the filter residue for 3-5 times by using deionized water, drying and then crushing again to obtain the modified waste plastic shell powder which is sieved by a 200-mesh sieve.
The qualification rate of the power capacitor shell is 97.6%, the Poisson ratio is 0.4195, and the elastic modulus is 0.88 GPa; the power capacitor shell is of a square type or a round type, the square power capacitor shell is selected and cut into a long strip with the length of 10cm, the width of 1cm and the thickness of 2mm, the long strip is bent at normal temperature for 90 degrees, and the long strip can be bent for 96 times without being damaged.
Example 2
Weighing isotactic polypropylene homopolymer, modified waste plastic shell powder, talcum powder, silicon micropowder, fluororubber, nucleating agent and antioxidant according to the mass ratio of 100:22:6.6:3.4:0.13:1.6:0.35, sequentially placing the materials in a stirrer, and uniformly mixing to prepare a mixture, wherein the antioxidant is a hindered phenol antioxidant and phosphite ester according to the mass ratio of 1:1The nucleating agent is a fatty carboxylic acid metal compound; placing the mixture into a hopper of a low-pressure injection molding machine, setting the temperature of each zone of a screw of the low-pressure injection molding machine to be 220-235 ℃, setting the temperature of a mold in the low-pressure injection molding machine to be 70-80 ℃, melting and plasticizing the mixture in the hopper of the low-pressure injection molding machine through each zone of the screw, and injecting the mixture into a cavity of the mold, wherein the melt rate is 30-40 cm3The glue melting pressure is 52-58 bar; injecting glue according to time period and sequence, wherein the injection speed is 39.5-41.3 cm3The glue injection pressure is 86-95 bar, the glue injection is divided into 6 sections for glue injection, and the time range of each glue injection time section is 4-6 s; and after the mold is cooled, opening the mold, ejecting out and taking out the mold to obtain the power capacitor shell.
The preparation method of the modified waste plastic shell powder comprises the following steps: crushing waste polypropylene capacitor shells into waste plastic powder which is sieved by a 120-mesh sieve, and uniformly mixing the waste plastic powder, benzoxazine resin, E51 type epoxy resin, linear phenolic resin, 2-methylimidazole, nickel sulfide and acetone according to the mass ratio of 100:53:27:13:0.56:18:55 to prepare a sizing material, wherein the benzoxazine resin is CB8 series fast curing type benzoxazine resin produced by Yokoku high molecular science and technology limited; then, feeding the rubber material into an oven, baking for 6-8 hours at 180-200 ℃ to prepare a plate-shaped rough blank with the thickness of 2-3 mm, rapidly freezing the plate-shaped rough blank by using liquid nitrogen, crushing the plate-shaped rough blank to prepare semi-finished product powder which is sieved by a 200-mesh sieve, immersing the semi-finished product powder into hydrochloric acid with the mass fraction of 6-10%, and boiling for 30-40 min to obtain a mixed solution, wherein the mass ratio of the semi-finished product powder to the hydrochloric acid is 1: 5; and filtering the mixed solution to obtain filter residue, washing the filter residue for 3-5 times by using deionized water, drying and then crushing again to obtain the modified waste plastic shell powder which is sieved by a 200-mesh sieve.
The qualification rate of the power capacitor shell is 98.5%, the Poisson ratio is 0.4201, and the elastic modulus is 0.88 GPa; the power capacitor shell is of a square type or a round type, the square power capacitor shell is selected and cut into strips with the length of 10cm, the width of 1cm and the thickness of 2mm, the strips are bent by 90 degrees at normal temperature, and the strips can be bent for 99 times without being damaged.
Example 3
Weighing isotactic polypropylene homopolymer, modified waste plastic shell powder, talcum powder, silicon micropowder, fluororubber, nucleating agent and antioxidant according to the mass ratio of 100:25:7:4:0.15:1.7:0.36, sequentially placing the materials in a stirrer, and uniformly mixing to prepare a mixture, wherein the antioxidant is thioether, and the nucleating agent is fatty carboxylic acid metal compound; placing the mixture into a hopper of a low-pressure injection molding machine, setting the temperature of each zone of a screw of the low-pressure injection molding machine to be 220-235 ℃, setting the temperature of a mold in the low-pressure injection molding machine to be 70-80 ℃, melting and plasticizing the mixture in the hopper of the low-pressure injection molding machine through each zone of the screw, and injecting the mixture into a cavity of the mold, wherein the melt rate is 30-40 cm3The glue melting pressure is 52-58 bar; injecting glue according to time period and sequence, wherein the injection speed is 39.5-41.3 cm3The glue injection pressure is 86-95 bar, the glue injection is divided into 6 sections for glue injection, and the time range of each glue injection time section is 4-6 s; and after the mold is cooled, opening the mold, ejecting out and taking out the mold to obtain the power capacitor shell.
The preparation method of the modified waste plastic shell powder comprises the following steps: crushing waste polypropylene capacitor shells into waste plastic powder which is sieved by a 120-mesh sieve, and uniformly mixing the waste plastic powder, benzoxazine resin, E51 type epoxy resin, linear phenolic resin, 2-methylimidazole, nickel sulfide and acetone according to the mass ratio of 100:55:28:15:0.6:19:60 to prepare a sizing material, wherein the benzoxazine resin is CB8 series fast curing type benzoxazine resin produced by Yokoku high molecular science and technology limited; then, feeding the rubber material into an oven, baking for 6-8 hours at 180-200 ℃ to prepare a plate-shaped rough blank with the thickness of 2-3 mm, rapidly freezing the plate-shaped rough blank by using liquid nitrogen, crushing the plate-shaped rough blank to prepare semi-finished product powder which is sieved by a 200-mesh sieve, immersing the semi-finished product powder into hydrochloric acid with the mass fraction of 6-10%, and boiling for 30-40 min to obtain a mixed solution, wherein the mass ratio of the semi-finished product powder to the hydrochloric acid is 1: 5; and filtering the mixed solution to obtain filter residue, washing the filter residue for 3-5 times by using deionized water, drying and then crushing again to obtain the modified waste plastic shell powder which is sieved by a 200-mesh sieve.
The qualification rate of the power capacitor shell is 98.1%, the Poisson ratio is 0.4192, and the elastic modulus is 0.88 GPa; the power capacitor shell is of a square type or a round type, the square power capacitor shell is selected and cut into a long strip with the length of 10cm, the width of 1cm and the thickness of 2mm, the long strip is bent by 90 degrees at normal temperature, and the long strip can be bent for 93 times without being damaged.
Example 4
Weighing isotactic polypropylene homopolymer, waste plastic powder, talcum powder, silicon micropowder, fluororubber, nucleating agent and antioxidant according to the mass ratio of 100:22:6.6:3.4:0.13:1.6:0.35, sequentially placing the materials in a stirrer, and uniformly mixing the materials to prepare a mixture, wherein the waste plastic powder is obtained by crushing waste polypropylene capacitor shells into powder which is sieved by a 120-mesh sieve, the antioxidant is prepared by mixing hindered phenol antioxidant and phosphite ester according to the mass ratio of 1:1, and the nucleating agent is fatty carboxylic acid metal compound; placing the mixture into a hopper of a low-pressure injection molding machine, setting the temperature of each zone of a screw of the low-pressure injection molding machine to be 220-235 ℃, setting the temperature of a mold in the low-pressure injection molding machine to be 70-80 ℃, melting and plasticizing the mixture in the hopper of the low-pressure injection molding machine through each zone of the screw, and injecting the mixture into a cavity of the mold, wherein the melt rate is 30-40 cm3The glue melting pressure is 52-58 bar; injecting glue according to time period and sequence, wherein the injection speed is 39.5-41.3 cm3The glue injection pressure is 86-95 bar, the glue injection is divided into 6 sections for glue injection, and the time range of each glue injection time section is 4-6 s; and (5) cooling the mold, opening the mold, ejecting out and taking out the mold to obtain a comparative power capacitor shell X.
The yield of the comparative power capacitor case X was 11.2%, the poisson ratio was 0.2319, and the elastic modulus was 0.53 GPa; the comparison power capacitor shell X has two types of a square type and a circular type, the square type comparison power capacitor shell X is selected and cut into a strip with the length of 10cm, the width of 1cm and the thickness of 2mm, the strip is bent at normal temperature for 90 degrees, and the strip is damaged after being bent for 21 times.
Example 5
Isotactic polypropylene homopolymer, comparative waste plastic shell powder A, talcum powder, silicon micropowder, fluororubber, nucleating agent and antioxidant are mixed according to qualityWeighing the components in a weight ratio of 100:22:6.6:3.4:0.13:1.6:0.35, and then sequentially placing the components in a stirrer to be uniformly mixed to prepare a mixture, wherein the antioxidant is prepared by mixing a hindered phenol antioxidant and phosphite ester according to a mass ratio of 1:1, and the nucleating agent is a fatty carboxylic acid metal compound; placing the mixture into a hopper of a low-pressure injection molding machine, setting the temperature of each zone of a screw of the low-pressure injection molding machine to be 220-235 ℃, setting the temperature of a mold in the low-pressure injection molding machine to be 70-80 ℃, melting and plasticizing the mixture in the hopper of the low-pressure injection molding machine through each zone of the screw, and injecting the mixture into a cavity of the mold, wherein the melt rate is 30-40 cm3The glue melting pressure is 52-58 bar; injecting glue according to time period and sequence, wherein the injection speed is 39.5-41.3 cm3The glue injection pressure is 86-95 bar, the glue injection is divided into 6 sections for glue injection, and the time range of each glue injection time section is 4-6 s; and (5) cooling the mold, opening the mold, ejecting out and taking out the mold to obtain a comparative power capacitor shell Y. Wherein the preparation method of the comparative waste plastic shell powder A comprises the following steps: crushing the waste polypropylene capacitor shell into waste plastic powder which is sieved by a 120-mesh sieve, rapidly freezing the waste plastic powder by using liquid nitrogen, and crushing the waste plastic powder into waste plastic powder which is sieved by a 200-mesh sieve, thus obtaining the comparative waste plastic shell powder A.
The yield of the comparative power capacitor case Y was 23.5%, the poisson ratio was 0.2501, and the elastic modulus was 0.57 GPa; the comparison power capacitor shell Y has two types of a square type and a circular type, the square type comparison power capacitor shell Y is selected, the square type comparison power capacitor shell Y is cut into a long strip with the length of 10cm, the width of 1cm and the thickness of 2mm, the long strip is bent at normal temperature for 90 degrees, and the long strip is damaged after being bent for 29 times.
Example 6
Weighing isotactic polypropylene homopolymer, comparative waste plastic shell powder B, talcum powder, silicon micropowder, fluororubber, nucleating agent and antioxidant according to the mass ratio of 100:22:6.6:3.4:0.13:1.6:0.35, sequentially placing the materials in a stirrer, and uniformly mixing to prepare a mixture, wherein the antioxidant is prepared by mixing hindered phenol antioxidant and phosphite ester according to the mass ratio of 1:1, and the nucleating agent is an aliphatic carboxylic acid metal compound; placing the mixture into a hopper of a low-pressure injection molding machine, and screwing the low-pressure injection molding machineSetting the temperature of each area of the rod to be 220-235 ℃, setting the temperature of a mold in a low-pressure injection molding machine to be 70-80 ℃, and performing melt plasticizing on a mixture in a hopper of the low-pressure injection molding machine through each area of a screw rod and then injecting the mixture into a cavity of the mold, wherein the melt adhesive speed is 30-40 cm3The glue melting pressure is 52-58 bar; injecting glue according to time period and sequence, wherein the injection speed is 39.5-41.3 cm3The glue injection pressure is 86-95 bar, the glue injection is divided into 6 sections for glue injection, and the time range of each glue injection time section is 4-6 s; and (5) cooling the mold, opening the mold, ejecting out and taking out the mold to obtain the comparative power capacitor shell Z.
Wherein the preparation method of the comparative waste plastic shell powder B comprises the following steps: crushing waste polypropylene capacitor shells into waste plastic powder which is sieved by a 120-mesh sieve, and uniformly mixing the waste plastic powder, benzoxazine resin, E51 type epoxy resin, linear phenolic resin, 2-methylimidazole, nickel sulfide and acetone according to the mass ratio of 100:53:27:13:0.56:18:55 to prepare a sizing material, wherein the benzoxazine resin is CB8 series fast curing type benzoxazine resin produced by Yokoku high molecular science and technology limited; then, feeding the rubber material into an oven, baking for 6-8 hours at 180-200 ℃ to prepare a plate-shaped rough blank with the thickness of 2-3 mm, crushing the plate-shaped rough blank to prepare semi-finished product powder which is sieved by a 200-mesh sieve, immersing the semi-finished product powder into hydrochloric acid with the mass fraction of 6% -10%, and boiling for 30-40 min to obtain a mixed solution, wherein the mass ratio of the semi-finished product powder to the hydrochloric acid is 1: 5; and filtering the mixed solution to obtain filter residue, washing the filter residue for 3-5 times by using deionized water, drying and then crushing again to obtain the contrast waste plastic shell powder B which is sieved by a 200-mesh sieve.
The yield of the comparative power capacitor shell Z is 25.8%, the Poisson ratio is 0.2596, and the elastic modulus is 0.59 GPa; the comparison power capacitor shell Z has two types of a square type and a round type, the square type comparison power capacitor shell Z is selected and cut into a strip with the length of 10cm, the width of 1cm and the thickness of 2mm, the strip is bent at normal temperature for 90 degrees, and the strip is damaged after being bent for 32 times.
In the above embodiments, in the manufacturing raw materials of the power capacitor case, the talc powder and the silica powder are used as reinforcing fillers, and at the same time, the talc powder and the silica powder have physical and mechanical properties of accelerating crystallization rate, increasing crystallization density, promoting grain size refinement, shortening molding cycle, and improving tensile strength, rigidity, thermal deformation temperature, impact resistance, creep resistance, and the like. Fluororubbers can improve the rheological properties of the fluid during injection moulding.
The fast curing benzoxazine resin interacts with E51 epoxy resin and linear phenolic resin, so that the fast curing benzoxazine resin can be fast cured at a lower temperature, 2-methylimidazole is used as a catalyst, the curing temperature of a system can be further reduced, and acetone is used as a solvent. The benzoxazine resin has the advantages of heat resistance and flame retardance of common thermosetting phenolic resin or thermoplastic phenolic resin, no release of small molecules in the forming and curing process of the resin, low product porosity, nearly zero shrinkage, small stress, no microcrack, good solubility and good process performance, and the benzoxazine resin is a cyclic monomer with low relative molecular mass and low viscosity before ring opening polymerization.
As can be seen from example 4, when waste polypropylene-based capacitor cases are directly pulverized into waste molding powder and added to the raw materials for manufacturing the power capacitor cases, the yield of the manufactured products is very low, and the products have poor elasticity and are not resistant to bending. It can be seen from the analysis of the embodiments 4 and 5 that the waste plastic powder is directly frozen by liquid nitrogen and then added to the raw material for manufacturing the power capacitor case, the crosslinked polypropylene is embrittled by the liquid nitrogen quick freezing, and when the crosslinked polypropylene is crushed into powder again, the crosslinked polypropylene is easily dispersed in the low-pressure injection fluid, the bonding degree of the crosslinked polypropylene and the isotactic polypropylene homopolymer is improved, the qualification rate and the elasticity of the product can be improved, but the improvement range is not large, wherein the improvement range of the qualification rate is not more than 110%, the improvement range of the poisson ratio is not more than 8%, the improvement range of the elastic modulus is not more than 7.5%, and the improvement range of the bending resistance is not more than 38%.
It can be seen from the analysis of the embodiments 4 and 6 that, benzoxazine resin, E51 type epoxy resin, phenol novolac resin, 2-methylimidazole, nickel sulfide, acetone, and the like are directly used for modifying the waste plastic powder, and then the modified waste plastic powder is added to the raw material for manufacturing the power capacitor shell, and the benzoxazine resin interacts with the E51 type epoxy resin and phenol novolac resin and is crosslinked with the polymerized polypropylene again, so that the yield and the elasticity of the product are improved, but the improvement range is not large, wherein the yield improvement range is not more than 130%, the poisson ratio improvement range is not more than 12%, the elastic modulus improvement range is not more than 11.4%, and the bending resistance improvement range is not more than 53%.
By analyzing the embodiments 1, 2, 3 and 4, it can be seen that the waste plastic powder is modified by benzoxazine resin, E51 type epoxy resin, phenol-formaldehyde novolac resin, 2-methylimidazole, nickel sulfide, acetone and the like to form a plate-shaped rough blank, then the plate-shaped rough blank is rapidly frozen by liquid nitrogen and then crushed to form powder, the content of nickel sulfide therein is reduced by hydrochloric acid to obtain modified waste plastic shell powder, the modified waste plastic shell powder is added to the raw material for manufacturing the power capacitor shell, so that the yield and elasticity of the finished product are remarkably improved, the yield improvement range exceeds 779%, the yield of the finished product can reach 98.5%, the poisson ratio improvement range exceeds 81%, the poisson ratio energy reaches 0.4201, the elastic modulus improvement range exceeds 66%, the elastic modulus can reach 0.88GPa, the bending resistance improvement range exceeds 371%, can be bent 99 times without damage. In the process, nickel sulfide is subjected to thermal shrinkage and cold expansion, and crosslinked polypropylene is embrittled in the process of rapidly freezing the plate-shaped rough blank by using liquid nitrogen, but the crosslinked polypropylene, benzoxazine resin, E51 type epoxy resin and cured phenolic resin are crushed into components which are easily crosslinked and combined with isotactic polypropylene homopolymer in an environment of nickel sulfide matched with extremely low temperature, so that the yield and the elasticity of the finished product are obviously improved. The nickel sulfide can be dissolved in hydrochloric acid, the content of the nickel sulfide in a subsequent finished product is reduced through hydrochloric acid treatment, and the influence on the heat shock resistance of the finished product due to overhigh content of the nickel sulfide is avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A low-voltage injection molding method for a power capacitor shell is characterized by comprising the following steps:
the method comprises the following steps: sequentially placing isotactic polypropylene homopolymer, modified waste plastic shell powder, talcum powder, silicon micropowder, fluororubber, nucleating agent and antioxidant in a stirrer, and uniformly mixing to prepare a mixture;
step two: placing the mixture into a hopper of a low-pressure injection molding machine, setting the temperature of each zone of a screw of the low-pressure injection molding machine to be 220-235 ℃, setting the temperature of a mold in the low-pressure injection molding machine to be 70-80 ℃, melting and plasticizing the mixture in the hopper of the low-pressure injection molding machine through each zone of the screw, and injecting the mixture into a cavity of the mold, wherein the melt rate is 30-40 cm3The glue melting pressure is 52-58 bar; injecting glue according to time periods and sequences, cooling the mould, opening the mould, ejecting out and taking out a product;
in the first step, the mass ratio of the isotactic polypropylene homopolymer, the modified waste plastic shell powder, the talcum powder, the silicon micropowder, the fluororubber, the nucleating agent and the antioxidant is 100 (20-25): 6-7): 3-4): 0.12-0.15): 1.5-1.7): 0.3-0.36;
the preparation method of the modified waste plastic shell powder comprises the steps of crushing waste plastic shells into waste plastic powder which is sieved by a 120-mesh sieve, uniformly mixing the waste plastic powder, benzoxazine resin, E51 type epoxy resin, linear phenolic resin, 2-methylimidazole, nickel sulfide and acetone according to the mass ratio of 100 (50-55) to (25-28) to (12-15) to (0.5-0.6) to (17-19) to (50-60) to prepare a sizing material, then putting the sizing material into an oven to bake for 6-8 hours at 180-200 ℃ to prepare a plate-shaped rough blank with the thickness of 2-3 mm, rapidly freezing the plate-shaped rough blank by using liquid nitrogen, crushing the plate-shaped rough blank to prepare semi-finished product powder which is sieved by the 200-mesh sieve, immersing the semi-finished product powder into hydrochloric acid with the mass fraction of 6-10% to boil for 30-40 minutes to obtain a mixed solution, wherein the mass ratio of the semi-finished product to the hydrochloric acid is 1-5; and filtering the mixed solution to obtain filter residue, washing the filter residue for 3-5 times by using deionized water, drying and then crushing again to obtain the modified waste plastic shell powder which is sieved by a 200-mesh sieve.
2. The low-pressure injection molding method for the power capacitor shell as claimed in claim 1, wherein the injection molding method comprises the following steps: the waste plastic shell is a waste polypropylene capacitor shell.
3. The low-pressure injection molding method for the power capacitor shell as claimed in claim 1, wherein the injection molding method comprises the following steps: the antioxidant is one or more of hindered phenol antioxidant, phosphite ester and thioether.
4. The low-pressure injection molding method for the power capacitor shell as claimed in claim 1, wherein the injection molding method comprises the following steps: the nucleating agent is an aliphatic carboxylic acid metal compound.
5. The low-pressure injection molding method for the power capacitor shell as claimed in claim 1, wherein the injection molding method comprises the following steps: the glue injection rate in the second step is 39.5-41.3 cm3And/s, the glue injection pressure is 86-95 bar.
6. The low-pressure injection molding method for the power capacitor shell as claimed in claim 1, wherein the injection molding method comprises the following steps: and the glue injection in the second step is divided into 6 sections for glue injection, and the time range of each glue injection time section is 4-6 s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711399470.XA CN107972224B (en) | 2017-12-22 | 2017-12-22 | Low-voltage injection molding method for power capacitor shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711399470.XA CN107972224B (en) | 2017-12-22 | 2017-12-22 | Low-voltage injection molding method for power capacitor shell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107972224A CN107972224A (en) | 2018-05-01 |
| CN107972224B true CN107972224B (en) | 2020-03-24 |
Family
ID=62007381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711399470.XA Active CN107972224B (en) | 2017-12-22 | 2017-12-22 | Low-voltage injection molding method for power capacitor shell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107972224B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109776967A (en) * | 2019-02-24 | 2019-05-21 | 成都市水泷头化工科技有限公司 | A kind of polypropylene dedicated material and preparation method for bumper |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0749821B1 (en) * | 1995-06-19 | 2003-03-05 | Siebolt Hettinga | A low pressure method for injection molding a plastic article |
| CN101784159A (en) * | 2009-01-21 | 2010-07-21 | 谈剑锋 | Method for encapsulating PCB by adopting low pressure injection molding technology |
| CN104292620A (en) * | 2014-09-24 | 2015-01-21 | 铜陵市新泰电容电器有限责任公司 | Novel high-hardness plastic shell composition for capacitor |
| CN104311991A (en) * | 2014-09-24 | 2015-01-28 | 铜陵市新泰电容电器有限责任公司 | High-temperature-resistant capacitor plastic shell and preparation method thereof |
| CN104755553A (en) * | 2012-11-02 | 2015-07-01 | 汉高知识产权控股有限责任公司 | Molding and overmolding compositions for electronic devices |
| CN105199227A (en) * | 2015-10-09 | 2015-12-30 | 铜陵昌满塑胶有限公司 | Manufacturing method of high-temperature-resistant flame-retardant environment-friendly capacitor shell |
| JP2016153189A (en) * | 2015-02-20 | 2016-08-25 | 宇部興産株式会社 | Method for manufacturing thermoplastic resin molded article from crushed product of thermoplastic resin molded article waste |
| CN106738735A (en) * | 2016-11-26 | 2017-05-31 | 滁州市天悦塑胶制品有限公司 | The processing method that a kind of ABS material is molded LED television shell |
-
2017
- 2017-12-22 CN CN201711399470.XA patent/CN107972224B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0749821B1 (en) * | 1995-06-19 | 2003-03-05 | Siebolt Hettinga | A low pressure method for injection molding a plastic article |
| CN101784159A (en) * | 2009-01-21 | 2010-07-21 | 谈剑锋 | Method for encapsulating PCB by adopting low pressure injection molding technology |
| CN104755553A (en) * | 2012-11-02 | 2015-07-01 | 汉高知识产权控股有限责任公司 | Molding and overmolding compositions for electronic devices |
| CN104292620A (en) * | 2014-09-24 | 2015-01-21 | 铜陵市新泰电容电器有限责任公司 | Novel high-hardness plastic shell composition for capacitor |
| CN104311991A (en) * | 2014-09-24 | 2015-01-28 | 铜陵市新泰电容电器有限责任公司 | High-temperature-resistant capacitor plastic shell and preparation method thereof |
| JP2016153189A (en) * | 2015-02-20 | 2016-08-25 | 宇部興産株式会社 | Method for manufacturing thermoplastic resin molded article from crushed product of thermoplastic resin molded article waste |
| CN105199227A (en) * | 2015-10-09 | 2015-12-30 | 铜陵昌满塑胶有限公司 | Manufacturing method of high-temperature-resistant flame-retardant environment-friendly capacitor shell |
| CN106738735A (en) * | 2016-11-26 | 2017-05-31 | 滁州市天悦塑胶制品有限公司 | The processing method that a kind of ABS material is molded LED television shell |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107972224A (en) | 2018-05-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104960136A (en) | Injection molding process | |
| CN115651349B (en) | PC/ABS composite material and preparation method thereof, blow molding die and blow molding method | |
| CN107972224B (en) | Low-voltage injection molding method for power capacitor shell | |
| CN108068287B (en) | Light guide injection molding process for forming thick-walled part by using PC (polycarbonate) material for LED (light-emitting diode) | |
| US20220002530A1 (en) | High melt strength styrene resin composition and preparation method therefor | |
| CN105014896A (en) | Injection molding process | |
| CN111545758A (en) | Novel 316L feed for low-temperature powder injection molding and preparation process | |
| CN100595048C (en) | Method for preparing polyphenylene sulfide plate with large plane | |
| CN108467580B (en) | 3D low-temperature printing material and preparation method thereof | |
| CN103980652A (en) | Chain-extension waste and old electric appliance casing ABS plastic and preparation method thereof | |
| CN102248626A (en) | Molding method suitable for PEEK (poly(ether-ether-ketone)) | |
| CN109575506B (en) | Modified polyformaldehyde and preparation method thereof | |
| CN103649200B (en) | Molded article | |
| CN104861260A (en) | Antistatic plastic hollow plate and preparation method thereof | |
| CN112574513A (en) | Polypropylene composite material and preparation method and application thereof | |
| CN106750878A (en) | Hollow glass micropearl filling modified polypropylene material | |
| CN111892766B (en) | PP material injection molding process and bottle cap prepared by same | |
| CN106217762A (en) | A kind of plastic injection technique | |
| CN100441389C (en) | Low-temperature pressure induction flow forming method for engineering plastics ABS | |
| CN117227119A (en) | Insert injection molding process | |
| CN112210162A (en) | Calcium carbonate filled PP composite material and method for manufacturing plastic part | |
| KR20230067843A (en) | Method of manufacturing super engineering recycled plastics using waste synthetic resins | |
| CN115403895A (en) | High-heat-resistance modified ABS material and preparation method thereof | |
| CN115651308A (en) | Improved plastic material based on PP plastic | |
| CN112876825A (en) | Calcium sulfate whisker-added polylactic acid material and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 242700 Anhui province Huangshan City Kowloon Low Carbon Economy Park Patentee after: Huangshan Shenge Electronic Technology Co., Ltd Address before: 242700 Anhui province Huangshan City Kowloon Low Carbon Economy Park Patentee before: HUANGSHAN SHENGE ELECTRONIC TECHNOLOGY Co.,Ltd. |